why carve it of wax use a wax pencil or crayon write out what you want. mix the acid with inate product to make a slurry or put it straight on and use the wax pencil to put a quick dam around it. quick and dirty. I suspect a slurry would be the easiest. there is a product on the market called peel away main ingediant as I remember is methal chloride. It comes in a putty and would do the job. Sure there was something similar in the areas
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